Pump



B. G. cARLsoN 2,268,695

PUMP

Filed Nov. 22, 1940 Jan. 6, 1942.

2 Sheets-Sheet l INVENTOR. BEIFT 6- CAZELSON Jan. 6, 1942. Lsou 72,268,695

PUMP

Filed Nov. 22, 1940 '2 Sheets-Sheet 2 INVENTOR. BERT 6- CA IEASO/VATTORNEYS Patented Jan. 6, 1%2

estates PUMP am o. Carlson, Willobee, Ohio, assignor to The -WeatherheadCompany. Cleveland, Ohio, a corporation of Ohio Application November 22,1940, Serial No. 366.678

2 Claims.

This invention relates broadly to pumps and more specifically toimprovements in hand operated pumps of the type particularly adapted foruse as airplane fuel pumps.

-The hand operated pumps used heretofore in connection with airplanefuel lines have ordinarily embodied oscillating vanes which areineilicient and which ordinarily required a manual adjustment prior tothe use of the hand pump and when changing over from the use of the handpump to the power operated fuel pump.

One of the objects of the present invention is the provision of a handoperated pump having a spring actuated check valve disposed within amain fluid line and arranged so that upon failure of fluid pressure inthe line the hand operated pump may be used, without requiring anypreliminary adjustments or manipulation of valves, and so that thepresence of the pump in the line will not affect the flow of fluid-inthe line.

Another object is to provide such a pump in which, upon thereciprocation of the pump piston, altemature inlet and outlet valvesfunction to by-pass a fluid around the closed check valve. Anotherobject is to provide a simple and compact hand pump embodying a springactuated check valve and a plurality of inlet and outlet by-pass valves.Further objects are to provide such a pump which is light in weight,reliable and eflicient in service, economical of manufacture, and whichis capable of being serviced without its removal from the fluid line.

Other objects and advantages more or less ancillary to the foregoing andthe manner in which all the various objects are realized will appear inthe following description, which considered in connection with theaccompanying drawings, sets forth the preferred embodiment of theinvention.

I preferably accomplish the above and other objects of the presentinvention by providing a pump casing having a fluid passagewaytherethrough with a spring actuated check valve therein, and with aplate embodying a plurality of inlet and outlet valves therein supportedupon the casing and having a cylinder and piston mounted thereon forpumping a fluid from one side of the check valve to the other.Preferably the cylinder is formed within a housing which is secured tothe casing and plate, the housing forming inlet and outlet passagesoutside of the cylinder, and the valves being disposeddn the plate.

Referring to the drawings wherein the preferred embodiment of theinvention is illustrated, Fig. 1 is a vertical sectional view of a handoperated pump made according to the present invention; Fig. 2 is an endview of the pump illustrating the manner in which the pump is secured toa support; Fig. 3 is a plan view of the pump showing the elongated upperhousing with the cylinder disposed therein, the view being taken on aplane indicated by line 33 of Fig. 2;

Fig. 4 is a vertical sectional view of the pumpv municating with achamber ll within the casing.

A partition wall 15 is formed integrally with the casing and divides thechamber ll into inlet and .outlet compartments. A valve seat I6 isprovided in the partition l5 and engageable by a check valve ll which ispivotally mounted within the outlet portion of the chamber M.

The pump casing I0 is open at its top and supports a plate l9, which hasa plurality of valve seats formed therein with an equal number thereofdisposed on the opposite sides of the partition wall. A plurality ofvalves 2|, 22, 23 and 2! are seated on the valve seats with the stemsthereof projecting through said plate. The valves 2i and 22 communicatewith the inlet compartment of chamber ll while valves 23 and 24communicate with the outlet compartment of the chamber. Coil springs 26encircling the stems of the valves are seated within recesses formed inthe opposite side of the plate i9 from that upon which the valves areseated. Collars 28 secured on the ends of the valve stems by pins areadapted to retain the springs 28 in compression for urging the valvesagainst their respective valve seats.

As shown in Figs. 1 and 3, an elongated housing 30, having a cylinder 3|formed integrally therewith and spaced from the ends 32 thereof toprovide passageways therebetween, is secured to the plate I! and casingill by threaded bolts 33. The cylinder 3! is supported on the plate 19within the central portion thereof so that inlet valve 2i and outletvalve 24 are in direct communication with the passageways between thecylinder and housing while the remaining valves in the plate l9 areenclosed by the cylinder 31. The fluid is pumped by a piston 35 which isslidably mounted within the cylinder 3| and has a screw 36 extendingtherethrough upon which is threaded a stem 38. The stem projects througha stuffing box 40 formed on the top of the elongated housing 30 and hasa handle 4| amxed to the free end thereof. A packing nut 42 threadedupon the periphery of the stumng ,box 40 retains and compresses thepacking.

Formed in the base of the pump casing I and communicating with thechamber H on opposite sides of the partition I! there are conduits 44and 45, which are connected together by a conduit 46. A bushing 41 isthreaded within the base of the pump casing ID in axial alignment withthe conduit 46 and has an adjusting screw 48 threaded in the endthereof. A coil spring 60 has one end thereof seated on a collar 5|formed on the end of the adjusting screw 48 while the opposite endengages a button 52 for seating a ball valve 54 upon a seat formed inone end of conduit 48. A closure cap 55 is threaded on the periphery ofthe bushing 41.

The plate l9 may be secured to any suitable support, such as the floorof an airplane cockpit, by bolts 60 for retaining the pump in a rigidand upright position. Thus in the replacement of parts or in theservicing of the pump the removal of the bolts 60 and 33 will permit thehousing 30, cylinder 3| and plate l9 to be lifted from the pump casingl0 without necessitating the removal of the casing from the fluid line.A leaf spring 62 disposed on the support for the valve IT has one endthereof bearing against the plate l9 and the opposite end engaging thevalve I! for urging it towards its seat I 6.

The hand pump is particularly adapted for use in airplane fuel lines orin any service where a drop in fluid pressure may be either costly ordangerous. For example, should the automatic fuel pump on an airplanefail to function, resulting in a drop in pressure in the fuel line, thespring 62 will seat the valve upon its seat l6, thus permitting the useof the hand operated pump. Upon the use of the hand operated pump fuelmay be drawn from the inlet port through the valves in the plate l9 anddelivered to the outlet port I 2 from whence it will be forced, underpressure, to the engine carburetor. The upward movement of the piston 35within the cylinder 3| will cause the inlet valve 22 to be opened due tothe suction created by'the piston within the cylinder. The opening ofthe valve 22 will cause fuel to be drawn into the cylinder 3| so thatupon the downstroke of the piston the fluid will be forced outwardlythrough the valve 23 while at the same time valve 2| will be opened, dueto the suction created within the housing, thus allowing fuel to b drawninto the passageway between the housing 30 and cylinder 3|. Thus uponthe succeeding suction stroke of the piston fuel will be drawn into thecylinder from the inlet port through valve 22 while at the same time thefuel contained between the housing and cylinder will be forced outthrough the valve 24 which communicates with the passageway disposedbetween the cylinder 3| and housing 30.

If the delivery of the fuel from the housing 30 and cylinder 3| throughthe valves 23 and 24 to the outlet port I2 is of such a magnitude as todevelop a pressure higher than can be accommodated by the carburetor thepressure relief ball valve 54 will then be unseated allowing the fluidto flow through the conduits 44, and 48 and into the inlet side of thechamber l4, thus tending to equalize the pressure on opposite sides ofthe valve The hand operated pump is susceptible of operation only whenthe valve I1 is seated, thus upon a drop in pressure within the fuelline the valve will engage its seat I6 so that the operation of the pumpmay be effected. The pump is capable of immediate use without thenecessity of any valve adjustment, and cannot interfere with the flow offluid through the casing l0.

Although the foregoing description is necessarily of a detailedcharacter, in order that the invention may be completely set forth, itis to be understood that the specific terminology is not intended to berestrictive or confining, and that various rearrangements of parts andmodifications of detail may be resorted to without departing from thscope or spirit of the invention as herein claimed.

I claim:

1. In a fuel pump comprising a chambered casing having inlet and outletpassages, a plate thereon, a housing on the plate, a cylinder on theplate within the housing and a piston in the cylinder, the combinationof a wall dividing said chamber into inlet and outlet compartmentscommunicating respectively with said inlet and outlet passages andaxially aligned with said passages, said wall having a valve controlledopening therethrough in axial alignment with said passages, the platehaving valve controlled openings for permitting flow of fluid from saidinlet compartment to the interior of said housing and cylinder and alsohaving other valve controlled openings for permitting flow of fluid fromsaid housing and cylinder to said outlet compartment.

2. In a fuel pump comprising a chambered casing having inlet and outletpassages, a plate Z5; thereon, a housing on the plate, a cylinder on theplate within the housing and a piston in the cylinder, the combinationof a wall dividing said chamber into inlet and outlet compartmentscommunicating respectively with said inlet and outlet passages andaxially aligned with said passages, said wall having an opening therethrough coaxial with said passages, a check valve pivotally mounted inthe outlet compartment for closing said opening upon a decrease inpressure in the inlet compartment, the plate having valve controlledopenings for permitting flow of fluid from said inlet compartment to theinterior of said housing and cylinder and also having other valvecontrolled openings for permitting flow of fluid from said housing andcylinder to said outlet compartment and a pressure regulating valvedisposed in the base of the casing for equalizing the pressure in saidoutlet and inlet compartments.

BERT G. CARLSON.

